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Volume 12, issue 4 | Copyright

Special issue: Oldest Ice: finding and interpreting climate proxies in ice...

The Cryosphere, 12, 1401-1414, 2018
https://doi.org/10.5194/tc-12-1401-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Apr 2018

Research article | 17 Apr 2018

Accumulation patterns around Dome C, East Antarctica, in the last 73 kyr

Marie G. P. Cavitte1,2, Frédéric Parrenin3, Catherine Ritz3, Duncan A. Young1, Brice Van Liefferinge4, Donald D. Blankenship1,2, Massimo Frezzotti5, and Jason L. Roberts6,7 Marie G. P. Cavitte et al.
  • 1Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USA
  • 2Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USA
  • 3Univ. Grenoble Alpes, CNRS, IRD, IGE, 38000 Grenoble, France
  • 4Laboratoire de Glaciologie, Université libre de Bruxelles, CP 160/03, Avenue F. D. Roosevelt 50, 1050 Brussels, Belgium
  • 5ENEA, Agenzia Nazionale per le nuove tecnologie, l'energia e lo sviluppo sostenibile, Rome, Italy
  • 6Australian Antarctic Division, Kingston, Tasmania 7050, Australia
  • 7Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, Tasmania 7001, Australia

Abstract. We reconstruct the pattern of surface accumulation in the region around Dome C, East Antarctica, since the last glacial. We use a set of 18 isochrones spanning all observable depths of the ice column, interpreted from various ice-penetrating radar surveys and a 1-D ice flow model to invert for accumulation rates in the region. The shallowest four isochrones are then used to calculate paleoaccumulation rates between isochrone pairs using a 1-D assumption where horizontal advection is negligible in the time interval of each layer. We observe that the large-scale (100skm) surface accumulation gradient is spatially stable through the last 73kyr, which reflects current modeled and observed precipitation gradients in the region. We also observe small-scale (10skm) accumulation variations linked to snow redistribution at the surface, due to changes in its slope and curvature in the prevailing wind direction that remain spatially stationary since the last glacial.

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We reconstruct the pattern of surface accumulation in the region around Dome C, East Antarctica, over the last 73 kyr. We use internal isochrones interpreted from ice-penetrating radar surveys and a 1-D ice flow model to invert for time-averaged and paleo-accumulation rates. We observe that surface accumulation patterns are stable through the last 73 kyr, consistent with current observed regional precipitation gradients and consistent interactions between prevailing winds and surface slope.
We reconstruct the pattern of surface accumulation in the region around Dome C, East Antarctica,...
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